General Information

Serial #

N/A

Part Number

1

Total Parts

2

AKA

LIM

Patents

N/A

General Description

Metal and synthetic components.

Dimensions

Note: These reflect the general size for storage and are not necessarily representative of the object's true dimensions.

Length

106.0 cm

Width

76.0 cm

Height

183.0 cm

Thickness

N/A

Weight

N/A

Diameter

N/A

Volume

N/A

Lexicon

Group

Communications

Category

Telephony

Sub-Category

N/A

Manufacturer

AKA

Nortel

Country

Canada

State/Province

Unknown

City

Unknown

Context

Country

Canada

State/Province

Ontario

Period

Used c. 1990 +

Canada

"Link Interface Module" (LIM; also known as Link Interface Unit or LIU) is one functional module of DMS-100 switch[ing system], designed and made in Canada. When Northern Telecom announced its DMS product line in 1976, it was the first telecommunication equipment manufacturer in the world to offer a complete line of digital telephone switches. As a product it has been extremely successful for Nortel and ongoing sales and service contracts provide a significant, and stable, portion of Nortel's revenue. (ref. 1)

Function

To provide signalling services between DMS-100 telephone switch at one central office and the DMS-100 at another.

Technical

The Link Interface Module (LIM, also known as the Link Interface Unit or LIU) uses common channel signalling (CCS, a.k.a. SS7), which uses a narrow band of the voice channel dedicated to signalling. To set up calls between exchanges, only this narrow band has to be used, leaving the remaining channel capacity free for other uses until the call connection is actually established. This makes for economical use of channel capacity and also allows data to be sent during the call without interfering with the conversation. (ref. 1)

Area Notes

Unknown

Details

Markings

All controls, components, etc. labelled; most also bear bar coded decals. "NT9X95AA/ REL 05/ NT9X9501/ REL 03", "MADE IN CANADA", and "NT9X70BB/ REL 03/ LIM 000" printed inside cabinet, on base.

Missing

Unknown.

Finish

Metal cabinet frame and access doors have grey enamel painted finish. Metal and synthetic modular components inside are predominantly brown, with green trim and labeling. Grey synthetic covering on cables. Numerous bright blue synthetic connectors visible inside cabinet back.

Decoration

N/A